deceptive

artful, crafty, cunning, devious, foxy, guileful, shady, shifty, slick, sly, sneaking, sneaky, subtile, subtle, trick, trickish, tricky, underhand, underhanded, wily

crooked, defrauding, dishonest, dissembling, double-dealing, duplicitous, faithless, fast, fraudulent, knavish, lying, mendacious, untrustworthy, untruthful

bogus, counterfeit, fake, feigned, forged, phony (also phoney), sham, spurious

insidious, perfidious, treacherous

artificial, backhanded, hypocritical, insincere, left-handed, two-faced

unconscionable, unethical, unprincipled, unscrupulous

deceitful, deceiving, deluding, delusive, delusory, false

artful, beguiling, cagey (also cagy), crafty, cunning, foxy, slick, sly, subtle, wily

defrauding, devious, furtive, slippery, sneaking, sneaky, trickish, tricky

insidious, perfidious, treacherous